Ask HN: legally can i build search niche web search engine?

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i want to build search engine that searching dally niche sites , like blogs first page's then present statistics based on the crawling. legally can i do this ?

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There is no legal restriction for crawling any web site. But you should respect robot.txt document for every single web site. Such as: https://www.facebook.com/robots.txt http://web.archive.org/robots.txt

Yes. You can. Google successfully defended it in the past : http://en.wikipedia.org/wiki/Field_v._Google

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